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    17．When _____ to hand in his homework，Philip told his teacher that he had left it home．（　　）
    A．askingB．askedC．having askedD．to be asked

    分析 当被要求交家庭作业时，Philip告诉老师他把家庭作业忘家里了．

    解答 答案是B．本题考查"连词+分词"的结构．"连词+分词"的结构在句中往往做状语，属于分词做状语；分词做状语时分词的选择是看分词和句子主语之间的关系：分词和句子主语之间是主谓关系（主动关系），用现在分词；分词和句子主语之间是动宾关系（被动关系），用过去分词；本题中连词when后的ask 和句子主语Philip之间是被动关系，所以答案选择B．

    点评 在非谓语动词的解题中要在掌握其基本用法的基础上关注并积累一些固定用法，结合具体语境做出合理的判断．

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